Chapter 1 IntroductionMH300
1-9
Do not install an external EMC filter. The EMC filter is connected to ground through the filter capacitors,
thus connecting the power input to ground. This is very dangerous and can easily damage the drive.
Asymmetric Ground System (Corner Grounded TN Systems)
Caution: Do not remove the RFI jumper while there is power to the input terminal of the drive.
In the following four situations, you must remove the RFI jumper. This is to prevent the system from
grounding through the RFI and filter capacitors and damaging the drive.
You must remove the RFI jumper
1. Grounding at a corner in a triangle configuration
L2
L3
L1
2. Grounding at a midpoint in a polygonal
configuration
L2
L3
L1
3. Grounding at one end in a single-phase
configuration
L1
N
4. No stable neutral grounding in a three-phase
autotransformer configuration
L1
L2
L3
L1
L2
L3
You can use the RFI jumper
Internal grounding through RFI capacitors, which reduces
electromagnetic radiation. In a symmetrically grounding
power system with higher EMC requirements, you can
install an EMC filter. As a reference, the diagram on the
right is a symmetrical grounding power system.
L2
L
L
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